<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
</head>
<body>
	<div id="father">
		<div id="laoda"></div>
		<div id="laoer"></div>
	</div>
	<script>
		
		var oLaoda = document.getElementById('laoda');
		// console.log(oLaoda.nextSibling);
		// console.log(oLaoda.nextElementSibling);

		// 兼容性
		// var a  = oLaoda.nextElementSibling  || oLaoda.nextSibling;
		// console.log(a);

		console.log(document.getElementById('father').children);

		console.log(oLaoda.parentNode);
	</script>
</body>
</html>